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/*
* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ExclusionShape_h
#define ExclusionShape_h
#include "BasicShapes.h"
#include "FloatRect.h"
#include "WritingMode.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
struct LineSegment {
LineSegment(float logicalLeft, float logicalRight)
: logicalLeft(logicalLeft)
, logicalRight(logicalRight)
{
}
float logicalLeft;
float logicalRight;
};
typedef Vector<LineSegment> SegmentList;
// A representation of a BasicShape that enables layout code to determine how to break a line up into segments
// that will fit within or around a shape. The line is defined by a pair of logical Y coordinates and the
// computed segments are returned as pairs of logical X coordinates. The BasicShape itself is defined in
// physical coordinates.
class ExclusionShape {
public:
static PassOwnPtr<ExclusionShape> createExclusionShape(const BasicShape*, float logicalBoxWidth, float logicalBoxHeight, WritingMode);
virtual ~ExclusionShape() { }
virtual FloatRect shapeLogicalBoundingBox() const = 0;
virtual bool isEmpty() const = 0;
virtual void getIncludedIntervals(float logicalTop, float logicalHeight, SegmentList&) const = 0;
virtual void getExcludedIntervals(float logicalTop, float logicalHeight, SegmentList&) const = 0;
protected:
float minYForLogicalLine(float logicalTop, float logicalHeight) const { return (m_writingMode == RightToLeftWritingMode) ? m_logicalBoxHeight - logicalTop - logicalHeight : logicalTop; }
float maxYForLogicalLine(float logicalTop, float logicalHeight) const { return (m_writingMode == RightToLeftWritingMode) ? m_logicalBoxHeight - logicalTop : logicalTop + logicalHeight; }
FloatRect internalToLogicalBoundingBox(FloatRect r) const { return (m_writingMode == RightToLeftWritingMode) ? FloatRect(r.x(), m_logicalBoxHeight - r.maxY(), r.width(), r.height()) : r; }
private:
WritingMode m_writingMode;
float m_logicalBoxWidth;
float m_logicalBoxHeight;
FloatRect m_boundingBox;
};
} // namespace WebCore
#endif // ExclusionShape_h
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